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   1 /*
   2  *  linux/net/iucv/af_iucv.c
   3  *
   4  *  IUCV protocol stack for Linux on zSeries
   5  *
   6  *  Copyright 2006 IBM Corporation
   7  *
   8  *  Author(s):  Jennifer Hunt <jenhunt@us.ibm.com>
   9  */
  10
  11 #define KMSG_COMPONENT "af_iucv"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/list.h>
  17 #include <linux/errno.h>
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/slab.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/init.h>
  23 #include <linux/poll.h>
  24 #include <net/sock.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/cpcmd.h>
  27 #include <linux/kmod.h>
  28
  29 #include <net/iucv/iucv.h>
  30 #include <net/iucv/af_iucv.h>
  31
  32 #define VERSION "1.1"
  33
  34 static char iucv_userid[80];
  35
  36 static struct proto_ops iucv_sock_ops;
  37
  38 static struct proto iucv_proto = {
  39         .name           = "AF_IUCV",
  40         .owner          = THIS_MODULE,
  41         .obj_size       = sizeof(struct iucv_sock),
  42 };
  43
  44 /* special AF_IUCV IPRM messages */
  45 static const u8 iprm_shutdown[8] =
  46         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  47
  48 #define TRGCLS_SIZE     (sizeof(((struct iucv_message *)0)->class))
  49
  50 /* macros to set/get socket control buffer at correct offset */
  51 #define CB_TAG(skb)     ((skb)->cb)             /* iucv message tag */
  52 #define CB_TAG_LEN      (sizeof(((struct iucv_message *) 0)->tag))
  53 #define CB_TRGCLS(skb)  ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
  54 #define CB_TRGCLS_LEN   (TRGCLS_SIZE)
  55
  56
  57 static void iucv_sock_kill(struct sock *sk);
  58 static void iucv_sock_close(struct sock *sk);
  59
  60 /* Call Back functions */
  61 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  62 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  63 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
  64 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
  65                                  u8 ipuser[16]);
  66 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
  67 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
  68
  69 static struct iucv_sock_list iucv_sk_list = {
  70         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
  71         .autobind_name = ATOMIC_INIT(0)
  72 };
  73
  74 static struct iucv_handler af_iucv_handler = {
  75         .path_pending     = iucv_callback_connreq,
  76         .path_complete    = iucv_callback_connack,
  77         .path_severed     = iucv_callback_connrej,
  78         .message_pending  = iucv_callback_rx,
  79         .message_complete = iucv_callback_txdone,
  80         .path_quiesced    = iucv_callback_shutdown,
  81 };
  82
  83 static inline void high_nmcpy(unsigned char *dst, char *src)
  84 {
  85        memcpy(dst, src, 8);
  86 }
  87
  88 static inline void low_nmcpy(unsigned char *dst, char *src)
  89 {
  90        memcpy(&dst[8], src, 8);
  91 }
  92
  93 /**
  94  * iucv_msg_length() - Returns the length of an iucv message.
  95  * @msg:        Pointer to struct iucv_message, MUST NOT be NULL
  96  *
  97  * The function returns the length of the specified iucv message @msg of data
  98  * stored in a buffer and of data stored in the parameter list (PRMDATA).
  99  *
 100  * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
 101  * data:
 102  *      PRMDATA[0..6]   socket data (max 7 bytes);
 103  *      PRMDATA[7]      socket data length value (len is 0xff - PRMDATA[7])
 104  *
 105  * The socket data length is computed by substracting the socket data length
 106  * value from 0xFF.
 107  * If the socket data len is greater 7, then PRMDATA can be used for special
 108  * notifications (see iucv_sock_shutdown); and further,
 109  * if the socket data len is > 7, the function returns 8.
 110  *
 111  * Use this function to allocate socket buffers to store iucv message data.
 112  */
 113 static inline size_t iucv_msg_length(struct iucv_message *msg)
 114 {
 115         size_t datalen;
 116
 117         if (msg->flags & IUCV_IPRMDATA) {
 118                 datalen = 0xff - msg->rmmsg[7];
 119                 return (datalen < 8) ? datalen : 8;
 120         }
 121         return msg->length;
 122 }
 123
 124 /* Timers */
 125 static void iucv_sock_timeout(unsigned long arg)
 126 {
 127         struct sock *sk = (struct sock *)arg;
 128
 129         bh_lock_sock(sk);
 130         sk->sk_err = ETIMEDOUT;
 131         sk->sk_state_change(sk);
 132         bh_unlock_sock(sk);
 133
 134         iucv_sock_kill(sk);
 135         sock_put(sk);
 136 }
 137
 138 static void iucv_sock_clear_timer(struct sock *sk)
 139 {
 140         sk_stop_timer(sk, &sk->sk_timer);
 141 }
 142
 143 static struct sock *__iucv_get_sock_by_name(char *nm)
 144 {
 145         struct sock *sk;
 146         struct hlist_node *node;
 147
 148         sk_for_each(sk, node, &iucv_sk_list.head)
 149                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 150                         return sk;
 151
 152         return NULL;
 153 }
 154
 155 static void iucv_sock_destruct(struct sock *sk)
 156 {
 157         skb_queue_purge(&sk->sk_receive_queue);
 158         skb_queue_purge(&sk->sk_write_queue);
 159 }
 160
 161 /* Cleanup Listen */
 162 static void iucv_sock_cleanup_listen(struct sock *parent)
 163 {
 164         struct sock *sk;
 165
 166         /* Close non-accepted connections */
 167         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 168                 iucv_sock_close(sk);
 169                 iucv_sock_kill(sk);
 170         }
 171
 172         parent->sk_state = IUCV_CLOSED;
 173         sock_set_flag(parent, SOCK_ZAPPED);
 174 }
 175
 176 /* Kill socket */
 177 static void iucv_sock_kill(struct sock *sk)
 178 {
 179         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 180                 return;
 181
 182         iucv_sock_unlink(&iucv_sk_list, sk);
 183         sock_set_flag(sk, SOCK_DEAD);
 184         sock_put(sk);
 185 }
 186
 187 /* Close an IUCV socket */
 188 static void iucv_sock_close(struct sock *sk)
 189 {
 190         unsigned char user_data[16];
 191         struct iucv_sock *iucv = iucv_sk(sk);
 192         int err;
 193         unsigned long timeo;
 194
 195         iucv_sock_clear_timer(sk);
 196         lock_sock(sk);
 197
 198         switch (sk->sk_state) {
 199         case IUCV_LISTEN:
 200                 iucv_sock_cleanup_listen(sk);
 201                 break;
 202
 203         case IUCV_CONNECTED:
 204         case IUCV_DISCONN:
 205                 err = 0;
 206
 207                 sk->sk_state = IUCV_CLOSING;
 208                 sk->sk_state_change(sk);
 209
 210                 if (!skb_queue_empty(&iucv->send_skb_q)) {
 211                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 212                                 timeo = sk->sk_lingertime;
 213                         else
 214                                 timeo = IUCV_DISCONN_TIMEOUT;
 215                         err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
 216                 }
 217
 218         case IUCV_CLOSING:   /* fall through */
 219                 sk->sk_state = IUCV_CLOSED;
 220                 sk->sk_state_change(sk);
 221
 222                 if (iucv->path) {
 223                         low_nmcpy(user_data, iucv->src_name);
 224                         high_nmcpy(user_data, iucv->dst_name);
 225                         ASCEBC(user_data, sizeof(user_data));
 226                         err = iucv_path_sever(iucv->path, user_data);
 227                         iucv_path_free(iucv->path);
 228                         iucv->path = NULL;
 229                 }
 230
 231                 sk->sk_err = ECONNRESET;
 232                 sk->sk_state_change(sk);
 233
 234                 skb_queue_purge(&iucv->send_skb_q);
 235                 skb_queue_purge(&iucv->backlog_skb_q);
 236
 237                 sock_set_flag(sk, SOCK_ZAPPED);
 238                 break;
 239
 240         default:
 241                 sock_set_flag(sk, SOCK_ZAPPED);
 242                 break;
 243         }
 244
 245         release_sock(sk);
 246         iucv_sock_kill(sk);
 247 }
 248
 249 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 250 {
 251         if (parent)
 252                 sk->sk_type = parent->sk_type;
 253 }
 254
 255 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
 256 {
 257         struct sock *sk;
 258
 259         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
 260         if (!sk)
 261                 return NULL;
 262
 263         sock_init_data(sock, sk);
 264         INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
 265         spin_lock_init(&iucv_sk(sk)->accept_q_lock);
 266         skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
 267         INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
 268         spin_lock_init(&iucv_sk(sk)->message_q.lock);
 269         skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
 270         iucv_sk(sk)->send_tag = 0;
 271         iucv_sk(sk)->flags = 0;
 272         iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT;
 273         iucv_sk(sk)->path = NULL;
 274         memset(&iucv_sk(sk)->src_user_id , 0, 32);
 275
 276         sk->sk_destruct = iucv_sock_destruct;
 277         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 278         sk->sk_allocation = GFP_DMA;
 279
 280         sock_reset_flag(sk, SOCK_ZAPPED);
 281
 282         sk->sk_protocol = proto;
 283         sk->sk_state    = IUCV_OPEN;
 284
 285         setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
 286
 287         iucv_sock_link(&iucv_sk_list, sk);
 288         return sk;
 289 }
 290
 291 /* Create an IUCV socket */
 292 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
 293 {
 294         struct sock *sk;
 295
 296         if (protocol && protocol != PF_IUCV)
 297                 return -EPROTONOSUPPORT;
 298
 299         sock->state = SS_UNCONNECTED;
 300
 301         switch (sock->type) {
 302         case SOCK_STREAM:
 303                 sock->ops = &iucv_sock_ops;
 304                 break;
 305         case SOCK_SEQPACKET:
 306                 /* currently, proto ops can handle both sk types */
 307                 sock->ops = &iucv_sock_ops;
 308                 break;
 309         default:
 310                 return -ESOCKTNOSUPPORT;
 311         }
 312
 313         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
 314         if (!sk)
 315                 return -ENOMEM;
 316
 317         iucv_sock_init(sk, NULL);
 318
 319         return 0;
 320 }
 321
 322 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 323 {
 324         write_lock_bh(&l->lock);
 325         sk_add_node(sk, &l->head);
 326         write_unlock_bh(&l->lock);
 327 }
 328
 329 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 330 {
 331         write_lock_bh(&l->lock);
 332         sk_del_node_init(sk);
 333         write_unlock_bh(&l->lock);
 334 }
 335
 336 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 337 {
 338         unsigned long flags;
 339         struct iucv_sock *par = iucv_sk(parent);
 340
 341         sock_hold(sk);
 342         spin_lock_irqsave(&par->accept_q_lock, flags);
 343         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 344         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 345         iucv_sk(sk)->parent = parent;
 346         parent->sk_ack_backlog++;
 347 }
 348
 349 void iucv_accept_unlink(struct sock *sk)
 350 {
 351         unsigned long flags;
 352         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 353
 354         spin_lock_irqsave(&par->accept_q_lock, flags);
 355         list_del_init(&iucv_sk(sk)->accept_q);
 356         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 357         iucv_sk(sk)->parent->sk_ack_backlog--;
 358         iucv_sk(sk)->parent = NULL;
 359         sock_put(sk);
 360 }
 361
 362 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 363 {
 364         struct iucv_sock *isk, *n;
 365         struct sock *sk;
 366
 367         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 368                 sk = (struct sock *) isk;
 369                 lock_sock(sk);
 370
 371                 if (sk->sk_state == IUCV_CLOSED) {
 372                         iucv_accept_unlink(sk);
 373                         release_sock(sk);
 374                         continue;
 375                 }
 376
 377                 if (sk->sk_state == IUCV_CONNECTED ||
 378                     sk->sk_state == IUCV_SEVERED ||
 379                     !newsock) {
 380                         iucv_accept_unlink(sk);
 381                         if (newsock)
 382                                 sock_graft(sk, newsock);
 383
 384                         if (sk->sk_state == IUCV_SEVERED)
 385                                 sk->sk_state = IUCV_DISCONN;
 386
 387                         release_sock(sk);
 388                         return sk;
 389                 }
 390
 391                 release_sock(sk);
 392         }
 393         return NULL;
 394 }
 395
 396 int iucv_sock_wait_state(struct sock *sk, int state, int state2,
 397                          unsigned long timeo)
 398 {
 399         DECLARE_WAITQUEUE(wait, current);
 400         int err = 0;
 401
 402         add_wait_queue(sk->sk_sleep, &wait);
 403         while (sk->sk_state != state && sk->sk_state != state2) {
 404                 set_current_state(TASK_INTERRUPTIBLE);
 405
 406                 if (!timeo) {
 407                         err = -EAGAIN;
 408                         break;
 409                 }
 410
 411                 if (signal_pending(current)) {
 412                         err = sock_intr_errno(timeo);
 413                         break;
 414                 }
 415
 416                 release_sock(sk);
 417                 timeo = schedule_timeout(timeo);
 418                 lock_sock(sk);
 419
 420                 err = sock_error(sk);
 421                 if (err)
 422                         break;
 423         }
 424         set_current_state(TASK_RUNNING);
 425         remove_wait_queue(sk->sk_sleep, &wait);
 426         return err;
 427 }
 428
 429 /* Bind an unbound socket */
 430 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 431                           int addr_len)
 432 {
 433         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 434         struct sock *sk = sock->sk;
 435         struct iucv_sock *iucv;
 436         int err;
 437
 438         /* Verify the input sockaddr */
 439         if (!addr || addr->sa_family != AF_IUCV)
 440                 return -EINVAL;
 441
 442         lock_sock(sk);
 443         if (sk->sk_state != IUCV_OPEN) {
 444                 err = -EBADFD;
 445                 goto done;
 446         }
 447
 448         write_lock_bh(&iucv_sk_list.lock);
 449
 450         iucv = iucv_sk(sk);
 451         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 452                 err = -EADDRINUSE;
 453                 goto done_unlock;
 454         }
 455         if (iucv->path) {
 456                 err = 0;
 457                 goto done_unlock;
 458         }
 459
 460         /* Bind the socket */
 461         memcpy(iucv->src_name, sa->siucv_name, 8);
 462
 463         /* Copy the user id */
 464         memcpy(iucv->src_user_id, iucv_userid, 8);
 465         sk->sk_state = IUCV_BOUND;
 466         err = 0;
 467
 468 done_unlock:
 469         /* Release the socket list lock */
 470         write_unlock_bh(&iucv_sk_list.lock);
 471 done:
 472         release_sock(sk);
 473         return err;
 474 }
 475
 476 /* Automatically bind an unbound socket */
 477 static int iucv_sock_autobind(struct sock *sk)
 478 {
 479         struct iucv_sock *iucv = iucv_sk(sk);
 480         char query_buffer[80];
 481         char name[12];
 482         int err = 0;
 483
 484         /* Set the userid and name */
 485         cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
 486         if (unlikely(err))
 487                 return -EPROTO;
 488
 489         memcpy(iucv->src_user_id, query_buffer, 8);
 490
 491         write_lock_bh(&iucv_sk_list.lock);
 492
 493         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 494         while (__iucv_get_sock_by_name(name)) {
 495                 sprintf(name, "%08x",
 496                         atomic_inc_return(&iucv_sk_list.autobind_name));
 497         }
 498
 499         write_unlock_bh(&iucv_sk_list.lock);
 500
 501         memcpy(&iucv->src_name, name, 8);
 502
 503         return err;
 504 }
 505
 506 /* Connect an unconnected socket */
 507 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 508                              int alen, int flags)
 509 {
 510         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 511         struct sock *sk = sock->sk;
 512         struct iucv_sock *iucv;
 513         unsigned char user_data[16];
 514         int err;
 515
 516         if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
 517                 return -EINVAL;
 518
 519         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 520                 return -EBADFD;
 521
 522         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 523                 return -EINVAL;
 524
 525         if (sk->sk_state == IUCV_OPEN) {
 526                 err = iucv_sock_autobind(sk);
 527                 if (unlikely(err))
 528                         return err;
 529         }
 530
 531         lock_sock(sk);
 532
 533         /* Set the destination information */
 534         memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
 535         memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
 536
 537         high_nmcpy(user_data, sa->siucv_name);
 538         low_nmcpy(user_data, iucv_sk(sk)->src_name);
 539         ASCEBC(user_data, sizeof(user_data));
 540
 541         iucv = iucv_sk(sk);
 542         /* Create path. */
 543         iucv->path = iucv_path_alloc(iucv->msglimit,
 544                                      IUCV_IPRMDATA, GFP_KERNEL);
 545         if (!iucv->path) {
 546                 err = -ENOMEM;
 547                 goto done;
 548         }
 549         err = iucv_path_connect(iucv->path, &af_iucv_handler,
 550                                 sa->siucv_user_id, NULL, user_data, sk);
 551         if (err) {
 552                 iucv_path_free(iucv->path);
 553                 iucv->path = NULL;
 554                 switch (err) {
 555                 case 0x0b:      /* Target communicator is not logged on */
 556                         err = -ENETUNREACH;
 557                         break;
 558                 case 0x0d:      /* Max connections for this guest exceeded */
 559                 case 0x0e:      /* Max connections for target guest exceeded */
 560                         err = -EAGAIN;
 561                         break;
 562                 case 0x0f:      /* Missing IUCV authorization */
 563                         err = -EACCES;
 564                         break;
 565                 default:
 566                         err = -ECONNREFUSED;
 567                         break;
 568                 }
 569                 goto done;
 570         }
 571
 572         if (sk->sk_state != IUCV_CONNECTED) {
 573                 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
 574                                 sock_sndtimeo(sk, flags & O_NONBLOCK));
 575         }
 576
 577         if (sk->sk_state == IUCV_DISCONN) {
 578                 err = -ECONNREFUSED;
 579         }
 580
 581         if (err) {
 582                 iucv_path_sever(iucv->path, NULL);
 583                 iucv_path_free(iucv->path);
 584                 iucv->path = NULL;
 585         }
 586
 587 done:
 588         release_sock(sk);
 589         return err;
 590 }
 591
 592 /* Move a socket into listening state. */
 593 static int iucv_sock_listen(struct socket *sock, int backlog)
 594 {
 595         struct sock *sk = sock->sk;
 596         int err;
 597
 598         lock_sock(sk);
 599
 600         err = -EINVAL;
 601         if (sk->sk_state != IUCV_BOUND)
 602                 goto done;
 603
 604         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 605                 goto done;
 606
 607         sk->sk_max_ack_backlog = backlog;
 608         sk->sk_ack_backlog = 0;
 609         sk->sk_state = IUCV_LISTEN;
 610         err = 0;
 611
 612 done:
 613         release_sock(sk);
 614         return err;
 615 }
 616
 617 /* Accept a pending connection */
 618 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 619                             int flags)
 620 {
 621         DECLARE_WAITQUEUE(wait, current);
 622         struct sock *sk = sock->sk, *nsk;
 623         long timeo;
 624         int err = 0;
 625
 626         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 627
 628         if (sk->sk_state != IUCV_LISTEN) {
 629                 err = -EBADFD;
 630                 goto done;
 631         }
 632
 633         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 634
 635         /* Wait for an incoming connection */
 636         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 637         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 638                 set_current_state(TASK_INTERRUPTIBLE);
 639                 if (!timeo) {
 640                         err = -EAGAIN;
 641                         break;
 642                 }
 643
 644                 release_sock(sk);
 645                 timeo = schedule_timeout(timeo);
 646                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 647
 648                 if (sk->sk_state != IUCV_LISTEN) {
 649                         err = -EBADFD;
 650                         break;
 651                 }
 652
 653                 if (signal_pending(current)) {
 654                         err = sock_intr_errno(timeo);
 655                         break;
 656                 }
 657         }
 658
 659         set_current_state(TASK_RUNNING);
 660         remove_wait_queue(sk->sk_sleep, &wait);
 661
 662         if (err)
 663                 goto done;
 664
 665         newsock->state = SS_CONNECTED;
 666
 667 done:
 668         release_sock(sk);
 669         return err;
 670 }
 671
 672 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 673                              int *len, int peer)
 674 {
 675         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 676         struct sock *sk = sock->sk;
 677
 678         addr->sa_family = AF_IUCV;
 679         *len = sizeof(struct sockaddr_iucv);
 680
 681         if (peer) {
 682                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
 683                 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
 684         } else {
 685                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
 686                 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
 687         }
 688         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
 689         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
 690         memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
 691
 692         return 0;
 693 }
 694
 695 /**
 696  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
 697  * @path:       IUCV path
 698  * @msg:        Pointer to a struct iucv_message
 699  * @skb:        The socket data to send, skb->len MUST BE <= 7
 700  *
 701  * Send the socket data in the parameter list in the iucv message
 702  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
 703  * list and the socket data len at index 7 (last byte).
 704  * See also iucv_msg_length().
 705  *
 706  * Returns the error code from the iucv_message_send() call.
 707  */
 708 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
 709                           struct sk_buff *skb)
 710 {
 711         u8 prmdata[8];
 712
 713         memcpy(prmdata, (void *) skb->data, skb->len);
 714         prmdata[7] = 0xff - (u8) skb->len;
 715         return iucv_message_send(path, msg, IUCV_IPRMDATA, 0,
 716                                  (void *) prmdata, 8);
 717 }
 718
 719 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 720                              struct msghdr *msg, size_t len)
 721 {
 722         struct sock *sk = sock->sk;
 723         struct iucv_sock *iucv = iucv_sk(sk);
 724         struct sk_buff *skb;
 725         struct iucv_message txmsg;
 726         struct cmsghdr *cmsg;
 727         int cmsg_done;
 728         char user_id[9];
 729         char appl_id[9];
 730         int err;
 731
 732         err = sock_error(sk);
 733         if (err)
 734                 return err;
 735
 736         if (msg->msg_flags & MSG_OOB)
 737                 return -EOPNOTSUPP;
 738
 739         /* SOCK_SEQPACKET: we do not support segmented records */
 740         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
 741                 return -EOPNOTSUPP;
 742
 743         lock_sock(sk);
 744
 745         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 746                 err = -EPIPE;
 747                 goto out;
 748         }
 749
 750         if (sk->sk_state == IUCV_CONNECTED) {
 751                 /* initialize defaults */
 752                 cmsg_done   = 0;        /* check for duplicate headers */
 753                 txmsg.class = 0;
 754
 755                 /* iterate over control messages */
 756                 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
 757                      cmsg = CMSG_NXTHDR(msg, cmsg)) {
 758
 759                         if (!CMSG_OK(msg, cmsg)) {
 760                                 err = -EINVAL;
 761                                 goto out;
 762                         }
 763
 764                         if (cmsg->cmsg_level != SOL_IUCV)
 765                                 continue;
 766
 767                         if (cmsg->cmsg_type & cmsg_done) {
 768                                 err = -EINVAL;
 769                                 goto out;
 770                         }
 771                         cmsg_done |= cmsg->cmsg_type;
 772
 773                         switch (cmsg->cmsg_type) {
 774                         case SCM_IUCV_TRGCLS:
 775                                 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
 776                                         err = -EINVAL;
 777                                         goto out;
 778                                 }
 779
 780                                 /* set iucv message target class */
 781                                 memcpy(&txmsg.class,
 782                                         (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
 783
 784                                 break;
 785
 786                         default:
 787                                 err = -EINVAL;
 788                                 goto out;
 789                                 break;
 790                         }
 791                 }
 792
 793                 /* allocate one skb for each iucv message:
 794                  * this is fine for SOCK_SEQPACKET (unless we want to support
 795                  * segmented records using the MSG_EOR flag), but
 796                  * for SOCK_STREAM we might want to improve it in future */
 797                 if (!(skb = sock_alloc_send_skb(sk, len,
 798                                                 msg->msg_flags & MSG_DONTWAIT,
 799                                                 &err)))
 800                         goto out;
 801
 802                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 803                         err = -EFAULT;
 804                         goto fail;
 805                 }
 806
 807                 /* increment and save iucv message tag for msg_completion cbk */
 808                 txmsg.tag = iucv->send_tag++;
 809                 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
 810                 skb_queue_tail(&iucv->send_skb_q, skb);
 811
 812                 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
 813                     && skb->len <= 7) {
 814                         err = iucv_send_iprm(iucv->path, &txmsg, skb);
 815
 816                         /* on success: there is no message_complete callback
 817                          * for an IPRMDATA msg; remove skb from send queue */
 818                         if (err == 0) {
 819                                 skb_unlink(skb, &iucv->send_skb_q);
 820                                 kfree_skb(skb);
 821                         }
 822
 823                         /* this error should never happen since the
 824                          * IUCV_IPRMDATA path flag is set... sever path */
 825                         if (err == 0x15) {
 826                                 iucv_path_sever(iucv->path, NULL);
 827                                 skb_unlink(skb, &iucv->send_skb_q);
 828                                 err = -EPIPE;
 829                                 goto fail;
 830                         }
 831                 } else
 832                         err = iucv_message_send(iucv->path, &txmsg, 0, 0,
 833                                                 (void *) skb->data, skb->len);
 834                 if (err) {
 835                         if (err == 3) {
 836                                 user_id[8] = 0;
 837                                 memcpy(user_id, iucv->dst_user_id, 8);
 838                                 appl_id[8] = 0;
 839                                 memcpy(appl_id, iucv->dst_name, 8);
 840                                 pr_err("Application %s on z/VM guest %s"
 841                                        " exceeds message limit\n",
 842                                        user_id, appl_id);
 843                         }
 844                         skb_unlink(skb, &iucv->send_skb_q);
 845                         err = -EPIPE;
 846                         goto fail;
 847                 }
 848
 849         } else {
 850                 err = -ENOTCONN;
 851                 goto out;
 852         }
 853
 854         release_sock(sk);
 855         return len;
 856
 857 fail:
 858         kfree_skb(skb);
 859 out:
 860         release_sock(sk);
 861         return err;
 862 }
 863
 864 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
 865 {
 866         int dataleft, size, copied = 0;
 867         struct sk_buff *nskb;
 868
 869         dataleft = len;
 870         while (dataleft) {
 871                 if (dataleft >= sk->sk_rcvbuf / 4)
 872                         size = sk->sk_rcvbuf / 4;
 873                 else
 874                         size = dataleft;
 875
 876                 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
 877                 if (!nskb)
 878                         return -ENOMEM;
 879
 880                 /* copy target class to control buffer of new skb */
 881                 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
 882
 883                 /* copy data fragment */
 884                 memcpy(nskb->data, skb->data + copied, size);
 885                 copied += size;
 886                 dataleft -= size;
 887
 888                 skb_reset_transport_header(nskb);
 889                 skb_reset_network_header(nskb);
 890                 nskb->len = size;
 891
 892                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
 893         }
 894
 895         return 0;
 896 }
 897
 898 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
 899                                  struct iucv_path *path,
 900                                  struct iucv_message *msg)
 901 {
 902         int rc;
 903         unsigned int len;
 904
 905         len = iucv_msg_length(msg);
 906
 907         /* store msg target class in the second 4 bytes of skb ctrl buffer */
 908         /* Note: the first 4 bytes are reserved for msg tag */
 909         memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
 910
 911         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
 912         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
 913                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
 914                         skb->data = NULL;
 915                         skb->len = 0;
 916                 }
 917         } else {
 918                 rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
 919                                           skb->data, len, NULL);
 920                 if (rc) {
 921                         kfree_skb(skb);
 922                         return;
 923                 }
 924                 /* we need to fragment iucv messages for SOCK_STREAM only;
 925                  * for SOCK_SEQPACKET, it is only relevant if we support
 926                  * record segmentation using MSG_EOR (see also recvmsg()) */
 927                 if (sk->sk_type == SOCK_STREAM &&
 928                     skb->truesize >= sk->sk_rcvbuf / 4) {
 929                         rc = iucv_fragment_skb(sk, skb, len);
 930                         kfree_skb(skb);
 931                         skb = NULL;
 932                         if (rc) {
 933                                 iucv_path_sever(path, NULL);
 934                                 return;
 935                         }
 936                         skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
 937                 } else {
 938                         skb_reset_transport_header(skb);
 939                         skb_reset_network_header(skb);
 940                         skb->len = len;
 941                 }
 942         }
 943
 944         if (sock_queue_rcv_skb(sk, skb))
 945                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
 946 }
 947
 948 static void iucv_process_message_q(struct sock *sk)
 949 {
 950         struct iucv_sock *iucv = iucv_sk(sk);
 951         struct sk_buff *skb;
 952         struct sock_msg_q *p, *n;
 953
 954         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
 955                 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
 956                 if (!skb)
 957                         break;
 958                 iucv_process_message(sk, skb, p->path, &p->msg);
 959                 list_del(&p->list);
 960                 kfree(p);
 961                 if (!skb_queue_empty(&iucv->backlog_skb_q))
 962                         break;
 963         }
 964 }
 965
 966 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 967                              struct msghdr *msg, size_t len, int flags)
 968 {
 969         int noblock = flags & MSG_DONTWAIT;
 970         struct sock *sk = sock->sk;
 971         struct iucv_sock *iucv = iucv_sk(sk);
 972         unsigned int copied, rlen;
 973         struct sk_buff *skb, *rskb, *cskb;
 974         int err = 0;
 975
 976         if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
 977             skb_queue_empty(&iucv->backlog_skb_q) &&
 978             skb_queue_empty(&sk->sk_receive_queue) &&
 979             list_empty(&iucv->message_q.list))
 980                 return 0;
 981
 982         if (flags & (MSG_OOB))
 983                 return -EOPNOTSUPP;
 984
 985         /* receive/dequeue next skb:
 986          * the function understands MSG_PEEK and, thus, does not dequeue skb */
 987         skb = skb_recv_datagram(sk, flags, noblock, &err);
 988         if (!skb) {
 989                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 990                         return 0;
 991                 return err;
 992         }
 993
 994         rlen   = skb->len;              /* real length of skb */
 995         copied = min_t(unsigned int, rlen, len);
 996
 997         cskb = skb;
 998         if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
 999                 if (!(flags & MSG_PEEK))
1000                         skb_queue_head(&sk->sk_receive_queue, skb);
1001                 return -EFAULT;
1002         }
1003
1004         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1005         if (sk->sk_type == SOCK_SEQPACKET) {
1006                 if (copied < rlen)
1007                         msg->msg_flags |= MSG_TRUNC;
1008                 /* each iucv message contains a complete record */
1009                 msg->msg_flags |= MSG_EOR;
1010         }
1011
1012         /* create control message to store iucv msg target class:
1013          * get the trgcls from the control buffer of the skb due to
1014          * fragmentation of original iucv message. */
1015         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1016                         CB_TRGCLS_LEN, CB_TRGCLS(skb));
1017         if (err) {
1018                 if (!(flags & MSG_PEEK))
1019                         skb_queue_head(&sk->sk_receive_queue, skb);
1020                 return err;
1021         }
1022
1023         /* Mark read part of skb as used */
1024         if (!(flags & MSG_PEEK)) {
1025
1026                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1027                 if (sk->sk_type == SOCK_STREAM) {
1028                         skb_pull(skb, copied);
1029                         if (skb->len) {
1030                                 skb_queue_head(&sk->sk_receive_queue, skb);
1031                                 goto done;
1032                         }
1033                 }
1034
1035                 kfree_skb(skb);
1036
1037                 /* Queue backlog skbs */
1038                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1039                 while (rskb) {
1040                         if (sock_queue_rcv_skb(sk, rskb)) {
1041                                 skb_queue_head(&iucv->backlog_skb_q,
1042                                                 rskb);
1043                                 break;
1044                         } else {
1045                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1046                         }
1047                 }
1048                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1049                         spin_lock_bh(&iucv->message_q.lock);
1050                         if (!list_empty(&iucv->message_q.list))
1051                                 iucv_process_message_q(sk);
1052                         spin_unlock_bh(&iucv->message_q.lock);
1053                 }
1054         }
1055
1056 done:
1057         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1058         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1059                 copied = rlen;
1060
1061         return copied;
1062 }
1063
1064 static inline unsigned int iucv_accept_poll(struct sock *parent)
1065 {
1066         struct iucv_sock *isk, *n;
1067         struct sock *sk;
1068
1069         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1070                 sk = (struct sock *) isk;
1071
1072                 if (sk->sk_state == IUCV_CONNECTED)
1073                         return POLLIN | POLLRDNORM;
1074         }
1075
1076         return 0;
1077 }
1078
1079 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1080                             poll_table *wait)
1081 {
1082         struct sock *sk = sock->sk;
1083         unsigned int mask = 0;
1084
1085         poll_wait(file, sk->sk_sleep, wait);
1086
1087         if (sk->sk_state == IUCV_LISTEN)
1088                 return iucv_accept_poll(sk);
1089
1090         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1091                 mask |= POLLERR;
1092
1093         if (sk->sk_shutdown & RCV_SHUTDOWN)
1094                 mask |= POLLRDHUP;
1095
1096         if (sk->sk_shutdown == SHUTDOWN_MASK)
1097                 mask |= POLLHUP;
1098
1099         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1100             (sk->sk_shutdown & RCV_SHUTDOWN))
1101                 mask |= POLLIN | POLLRDNORM;
1102
1103         if (sk->sk_state == IUCV_CLOSED)
1104                 mask |= POLLHUP;
1105
1106         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
1107                 mask |= POLLIN;
1108
1109         if (sock_writeable(sk))
1110                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1111         else
1112                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1113
1114         return mask;
1115 }
1116
1117 static int iucv_sock_shutdown(struct socket *sock, int how)
1118 {
1119         struct sock *sk = sock->sk;
1120         struct iucv_sock *iucv = iucv_sk(sk);
1121         struct iucv_message txmsg;
1122         int err = 0;
1123
1124         how++;
1125
1126         if ((how & ~SHUTDOWN_MASK) || !how)
1127                 return -EINVAL;
1128
1129         lock_sock(sk);
1130         switch (sk->sk_state) {
1131         case IUCV_DISCONN:
1132         case IUCV_CLOSING:
1133         case IUCV_SEVERED:
1134         case IUCV_CLOSED:
1135                 err = -ENOTCONN;
1136                 goto fail;
1137
1138         default:
1139                 sk->sk_shutdown |= how;
1140                 break;
1141         }
1142
1143         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1144                 txmsg.class = 0;
1145                 txmsg.tag = 0;
1146                 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
1147                                         (void *) iprm_shutdown, 8);
1148                 if (err) {
1149                         switch (err) {
1150                         case 1:
1151                                 err = -ENOTCONN;
1152                                 break;
1153                         case 2:
1154                                 err = -ECONNRESET;
1155                                 break;
1156                         default:
1157                                 err = -ENOTCONN;
1158                                 break;
1159                         }
1160                 }
1161         }
1162
1163         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1164                 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
1165                 if (err)
1166                         err = -ENOTCONN;
1167
1168                 skb_queue_purge(&sk->sk_receive_queue);
1169         }
1170
1171         /* Wake up anyone sleeping in poll */
1172         sk->sk_state_change(sk);
1173
1174 fail:
1175         release_sock(sk);
1176         return err;
1177 }
1178
1179 static int iucv_sock_release(struct socket *sock)
1180 {
1181         struct sock *sk = sock->sk;
1182         int err = 0;
1183
1184         if (!sk)
1185                 return 0;
1186
1187         iucv_sock_close(sk);
1188
1189         /* Unregister with IUCV base support */
1190         if (iucv_sk(sk)->path) {
1191                 iucv_path_sever(iucv_sk(sk)->path, NULL);
1192                 iucv_path_free(iucv_sk(sk)->path);
1193                 iucv_sk(sk)->path = NULL;
1194         }
1195
1196         sock_orphan(sk);
1197         iucv_sock_kill(sk);
1198         return err;
1199 }
1200
1201 /* getsockopt and setsockopt */
1202 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1203                                 char __user *optval, int optlen)
1204 {
1205         struct sock *sk = sock->sk;
1206         struct iucv_sock *iucv = iucv_sk(sk);
1207         int val;
1208         int rc;
1209
1210         if (level != SOL_IUCV)
1211                 return -ENOPROTOOPT;
1212
1213         if (optlen < sizeof(int))
1214                 return -EINVAL;
1215
1216         if (get_user(val, (int __user *) optval))
1217                 return -EFAULT;
1218
1219         rc = 0;
1220
1221         lock_sock(sk);
1222         switch (optname) {
1223         case SO_IPRMDATA_MSG:
1224                 if (val)
1225                         iucv->flags |= IUCV_IPRMDATA;
1226                 else
1227                         iucv->flags &= ~IUCV_IPRMDATA;
1228                 break;
1229         case SO_MSGLIMIT:
1230                 switch (sk->sk_state) {
1231                 case IUCV_OPEN:
1232                 case IUCV_BOUND:
1233                         if (val < 1 || val > (u16)(~0))
1234                                 rc = -EINVAL;
1235                         else
1236                                 iucv->msglimit = val;
1237                         break;
1238                 default:
1239                         rc = -EINVAL;
1240                         break;
1241                 }
1242                 break;
1243         default:
1244                 rc = -ENOPROTOOPT;
1245                 break;
1246         }
1247         release_sock(sk);
1248
1249         return rc;
1250 }
1251
1252 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1253                                 char __user *optval, int __user *optlen)
1254 {
1255         struct sock *sk = sock->sk;
1256         struct iucv_sock *iucv = iucv_sk(sk);
1257         int val, len;
1258
1259         if (level != SOL_IUCV)
1260                 return -ENOPROTOOPT;
1261
1262         if (get_user(len, optlen))
1263                 return -EFAULT;
1264
1265         if (len < 0)
1266                 return -EINVAL;
1267
1268         len = min_t(unsigned int, len, sizeof(int));
1269
1270         switch (optname) {
1271         case SO_IPRMDATA_MSG:
1272                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1273                 break;
1274         case SO_MSGLIMIT:
1275                 lock_sock(sk);
1276                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1277                                            : iucv->msglimit;    /* default */
1278                 release_sock(sk);
1279                 break;
1280         default:
1281                 return -ENOPROTOOPT;
1282         }
1283
1284         if (put_user(len, optlen))
1285                 return -EFAULT;
1286         if (copy_to_user(optval, &val, len))
1287                 return -EFAULT;
1288
1289         return 0;
1290 }
1291
1292
1293 /* Callback wrappers - called from iucv base support */
1294 static int iucv_callback_connreq(struct iucv_path *path,
1295                                  u8 ipvmid[8], u8 ipuser[16])
1296 {
1297         unsigned char user_data[16];
1298         unsigned char nuser_data[16];
1299         unsigned char src_name[8];
1300         struct hlist_node *node;
1301         struct sock *sk, *nsk;
1302         struct iucv_sock *iucv, *niucv;
1303         int err;
1304
1305         memcpy(src_name, ipuser, 8);
1306         EBCASC(src_name, 8);
1307         /* Find out if this path belongs to af_iucv. */
1308         read_lock(&iucv_sk_list.lock);
1309         iucv = NULL;
1310         sk = NULL;
1311         sk_for_each(sk, node, &iucv_sk_list.head)
1312                 if (sk->sk_state == IUCV_LISTEN &&
1313                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1314                         /*
1315                          * Found a listening socket with
1316                          * src_name == ipuser[0-7].
1317                          */
1318                         iucv = iucv_sk(sk);
1319                         break;
1320                 }
1321         read_unlock(&iucv_sk_list.lock);
1322         if (!iucv)
1323                 /* No socket found, not one of our paths. */
1324                 return -EINVAL;
1325
1326         bh_lock_sock(sk);
1327
1328         /* Check if parent socket is listening */
1329         low_nmcpy(user_data, iucv->src_name);
1330         high_nmcpy(user_data, iucv->dst_name);
1331         ASCEBC(user_data, sizeof(user_data));
1332         if (sk->sk_state != IUCV_LISTEN) {
1333                 err = iucv_path_sever(path, user_data);
1334                 iucv_path_free(path);
1335                 goto fail;
1336         }
1337
1338         /* Check for backlog size */
1339         if (sk_acceptq_is_full(sk)) {
1340                 err = iucv_path_sever(path, user_data);
1341                 iucv_path_free(path);
1342                 goto fail;
1343         }
1344
1345         /* Create the new socket */
1346         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1347         if (!nsk) {
1348                 err = iucv_path_sever(path, user_data);
1349                 iucv_path_free(path);
1350                 goto fail;
1351         }
1352
1353         niucv = iucv_sk(nsk);
1354         iucv_sock_init(nsk, sk);
1355
1356         /* Set the new iucv_sock */
1357         memcpy(niucv->dst_name, ipuser + 8, 8);
1358         EBCASC(niucv->dst_name, 8);
1359         memcpy(niucv->dst_user_id, ipvmid, 8);
1360         memcpy(niucv->src_name, iucv->src_name, 8);
1361         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1362         niucv->path = path;
1363
1364         /* Call iucv_accept */
1365         high_nmcpy(nuser_data, ipuser + 8);
1366         memcpy(nuser_data + 8, niucv->src_name, 8);
1367         ASCEBC(nuser_data + 8, 8);
1368
1369         /* set message limit for path based on msglimit of accepting socket */
1370         niucv->msglimit = iucv->msglimit;
1371         path->msglim = iucv->msglimit;
1372         err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1373         if (err) {
1374                 err = iucv_path_sever(path, user_data);
1375                 iucv_path_free(path);
1376                 iucv_sock_kill(nsk);
1377                 goto fail;
1378         }
1379
1380         iucv_accept_enqueue(sk, nsk);
1381
1382         /* Wake up accept */
1383         nsk->sk_state = IUCV_CONNECTED;
1384         sk->sk_data_ready(sk, 1);
1385         err = 0;
1386 fail:
1387         bh_unlock_sock(sk);
1388         return 0;
1389 }
1390
1391 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1392 {
1393         struct sock *sk = path->private;
1394
1395         sk->sk_state = IUCV_CONNECTED;
1396         sk->sk_state_change(sk);
1397 }
1398
1399 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1400 {
1401         struct sock *sk = path->private;
1402         struct iucv_sock *iucv = iucv_sk(sk);
1403         struct sk_buff *skb;
1404         struct sock_msg_q *save_msg;
1405         int len;
1406
1407         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1408                 iucv_message_reject(path, msg);
1409                 return;
1410         }
1411
1412         spin_lock(&iucv->message_q.lock);
1413
1414         if (!list_empty(&iucv->message_q.list) ||
1415             !skb_queue_empty(&iucv->backlog_skb_q))
1416                 goto save_message;
1417
1418         len = atomic_read(&sk->sk_rmem_alloc);
1419         len += iucv_msg_length(msg) + sizeof(struct sk_buff);
1420         if (len > sk->sk_rcvbuf)
1421                 goto save_message;
1422
1423         skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1424         if (!skb)
1425                 goto save_message;
1426
1427         iucv_process_message(sk, skb, path, msg);
1428         goto out_unlock;
1429
1430 save_message:
1431         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1432         if (!save_msg)
1433                 return;
1434         save_msg->path = path;
1435         save_msg->msg = *msg;
1436
1437         list_add_tail(&save_msg->list, &iucv->message_q.list);
1438
1439 out_unlock:
1440         spin_unlock(&iucv->message_q.lock);
1441 }
1442
1443 static void iucv_callback_txdone(struct iucv_path *path,
1444                                  struct iucv_message *msg)
1445 {
1446         struct sock *sk = path->private;
1447         struct sk_buff *this = NULL;
1448         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1449         struct sk_buff *list_skb = list->next;
1450         unsigned long flags;
1451
1452         if (!skb_queue_empty(list)) {
1453                 spin_lock_irqsave(&list->lock, flags);
1454
1455                 while (list_skb != (struct sk_buff *)list) {
1456                         if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1457                                 this = list_skb;
1458                                 break;
1459                         }
1460                         list_skb = list_skb->next;
1461                 }
1462                 if (this)
1463                         __skb_unlink(this, list);
1464
1465                 spin_unlock_irqrestore(&list->lock, flags);
1466
1467                 kfree_skb(this);
1468         }
1469         BUG_ON(!this);
1470
1471         if (sk->sk_state == IUCV_CLOSING) {
1472                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1473                         sk->sk_state = IUCV_CLOSED;
1474                         sk->sk_state_change(sk);
1475                 }
1476         }
1477
1478 }
1479
1480 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1481 {
1482         struct sock *sk = path->private;
1483
1484         if (!list_empty(&iucv_sk(sk)->accept_q))
1485                 sk->sk_state = IUCV_SEVERED;
1486         else
1487                 sk->sk_state = IUCV_DISCONN;
1488
1489         sk->sk_state_change(sk);
1490 }
1491
1492 /* called if the other communication side shuts down its RECV direction;
1493  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1494  */
1495 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1496 {
1497         struct sock *sk = path->private;
1498
1499         bh_lock_sock(sk);
1500         if (sk->sk_state != IUCV_CLOSED) {
1501                 sk->sk_shutdown |= SEND_SHUTDOWN;
1502                 sk->sk_state_change(sk);
1503         }
1504         bh_unlock_sock(sk);
1505 }
1506
1507 static struct proto_ops iucv_sock_ops = {
1508         .family         = PF_IUCV,
1509         .owner          = THIS_MODULE,
1510         .release        = iucv_sock_release,
1511         .bind           = iucv_sock_bind,
1512         .connect        = iucv_sock_connect,
1513         .listen         = iucv_sock_listen,
1514         .accept         = iucv_sock_accept,
1515         .getname        = iucv_sock_getname,
1516         .sendmsg        = iucv_sock_sendmsg,
1517         .recvmsg        = iucv_sock_recvmsg,
1518         .poll           = iucv_sock_poll,
1519         .ioctl          = sock_no_ioctl,
1520         .mmap           = sock_no_mmap,
1521         .socketpair     = sock_no_socketpair,
1522         .shutdown       = iucv_sock_shutdown,
1523         .setsockopt     = iucv_sock_setsockopt,
1524         .getsockopt     = iucv_sock_getsockopt,
1525 };
1526
1527 static struct net_proto_family iucv_sock_family_ops = {
1528         .family = AF_IUCV,
1529         .owner  = THIS_MODULE,
1530         .create = iucv_sock_create,
1531 };
1532
1533 static int __init afiucv_init(void)
1534 {
1535         int err;
1536
1537         if (!MACHINE_IS_VM) {
1538                 pr_err("The af_iucv module cannot be loaded"
1539                        " without z/VM\n");
1540                 err = -EPROTONOSUPPORT;
1541                 goto out;
1542         }
1543         cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1544         if (unlikely(err)) {
1545                 WARN_ON(err);
1546                 err = -EPROTONOSUPPORT;
1547                 goto out;
1548         }
1549
1550         err = iucv_register(&af_iucv_handler, 0);
1551         if (err)
1552                 goto out;
1553         err = proto_register(&iucv_proto, 0);
1554         if (err)
1555                 goto out_iucv;
1556         err = sock_register(&iucv_sock_family_ops);
1557         if (err)
1558                 goto out_proto;
1559         return 0;
1560
1561 out_proto:
1562         proto_unregister(&iucv_proto);
1563 out_iucv:
1564         iucv_unregister(&af_iucv_handler, 0);
1565 out:
1566         return err;
1567 }
1568
1569 static void __exit afiucv_exit(void)
1570 {
1571         sock_unregister(PF_IUCV);
1572         proto_unregister(&iucv_proto);
1573         iucv_unregister(&af_iucv_handler, 0);
1574 }
1575
1576 module_init(afiucv_init);
1577 module_exit(afiucv_exit);
1578
1579 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1580 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1581 MODULE_VERSION(VERSION);
1582 MODULE_LICENSE("GPL");
1583 MODULE_ALIAS_NETPROTO(PF_IUCV);